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Bright dipping for aluminum

2004

Hi,

I'm Sherief Fawzy a production manager for an anodizing plant in Saudi Arabia. I used to use a bright dipping tank for aluminum before anodizing which is a mixture of phosphoric acid 85% and sulfuric acid 98% with ratio of 1:1 at 90 °C and this gives me a good results for aluminum sheets and profiles and I have found that you suggesting mixture of phosphoric, sulfuric, nitric and some copper salt additives. Could you please tell me the actual ratios for this mixture for industrial use? I have a problem of over heating during the brightening by phosphoric sulfuric 1:1 mixture can I avoid this? can you send me the way of analysis for your mixtures?

Thank you, kind regards,

Sherief E [last name deleted for privacy by Editor]
anodizing plant - Jeddah, Kingdom of Saudi Arabia

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2004

Alupol II:
water 159 ml
phosphoric acid (conc.) 631 ml
acetic acid ⇦ this on eBay or Amazon [affil links] (conc.) 140 ml
nitric acid (conc.) 65 ml
copper nitrate ⇦ this on eBay or Amazon [affil links] 1 gm
8o C,1-3 sec

Goran Budija
- Cerovski vrh Croatia